"tags" are used to add a thread into someone's ego search ("View your posts") when they want to follow a thread, but are too lazy to actually contribute to the thread with their post. Originating out of the RP forums like NationStates, International Incidents, and F7, "tags" are used to keep tabs on RP's you might be interested in joining or watching. Though technically spam, enforcement of such within those subforums is often lax or nonexistent.
The Bookmark function is superior to tagging a thread, as it allows you to follow the thread without committing it to your ego search, nor does it require a pointless post.
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